Hi,
Can those 2 routers be use in a mesh network so that laptops can connect to them and go on the net? All the other mesh routers/repeaters I've seen can run in multiple modes.
they can be used in mesh but as you noticed the wifi cards are not able to open multiple wifi networks at the same time. If you want to offer managed networks for the laptops you need to find other solutions. Either you use Atheros based devices that can open multiple networks or you connect 2 devices (e.g. wrt54gl) via Ethernet (one opens the managed network and the other meshes in ad-hoc mode).
Regards, Marek